condition mean min max ZT0-3 8.6584275 8.05878 9.258075 ZT4-7 8.2181 8.2181 8.2181 ZT8-11 11.27835 11.27835 11.27835 ZT12-15 0 0 0 ZT16-19 12.5616 12.5616 12.5616 ZT20-23 10.50312 10.50312 10.50312